Electrostatic condenser



Nov. I23 1926.

1,607,856 E. E. YAxl- EY ELECTROSTATIC coNDENsER Filed March 1o; 1926 l'g Z is preferably Patented Nov. 23, 1926.

:ERNEST E. YAXLEY, OF CHICAGO, ILL'INOIS.

VILIIZIECTROSTA'IC CONDENSER.

Application tiled March 10, 1925. Serial No. 93,620.

My invention relates to electrostatic condensers employing relativelyfixedy plates and has for its general object an improvement in themechanical construction of such condensers for the purpose ofsimplifying the parts thereof and ensuring electrical accuracy.

In accordance with one characteristic of my invention, an insulatingmember is provided which is formed or provided with an angular rim orother abutment and with which two metallic condenser plates areassembled in a manner to be disposed within said rim. Each of theseplates is formed f with a plurality 'of projections extending at oneborder beyond the body thereof toward said rim or other abutment, theseprojections upon each plate being so relatively positioned as to preventthe portions of the plate border between the projections from contact-,ing with the rim. The dielectric which is disposed between the platesis of suchl size that its border extends beyond the border portions ofthe plate that intervenes between the plate projections. In thepreferred embodiment of the invention, the projections upon each plateare in staggered relation to the projections upon the other. By this arrangement, any burrs or inequalities that are present upon the border ofeither con-y denser plate are prevented, by the dielectric, fromcontacting with the other condenser plate, an important feature ofconstruction in the mass productionof condensers.

In accordance with another feature of my invention, the insulatingmember which is formed with the angular rim, as hitherto stated, is inthe form of a plate, there heilig means for clamping all of the platesof the condenser together. This clamping means in the form of a rivetpassed through all of the plates and the dielectric, this rivet havingheads upon its ends between which the plates and dielectric are disposed. These structural features of my invention are believed to be newwith me whether or not the metallic condenser plates are provided withprojections for the purpose of preventing the body portions of thecondenser plates from engaging the rim of the insulating plate.

The invention has other features and will be more fully explained byreference to the accompanying drawing in which Fig. 1 is a perspectiveview constructed in accordance with one feature of my invention; Fig.

2 is a sectional view taken on line 2-2 of Fig. l; Fig. 3 is a sectionalview taken at right angles to the direction in which Fig. 2 is talren;Fig. a is a sectional view talren on line l-i of Fig 3; Fig. 5 is asectional view similar to Fig. 2 but prior to the final heading yof therivet; and Fig.l 6 is a perspective view illustrative of a number ofparts of the condenser in separated relation.

The insulating supporting member of the `condenijer is preferably in theform of circular plate l having a rim 2 which is angular to the body ofthe plate l and eX- tending away from the plate in one direction andanother angular rim 3 'extending away from theplate in an oppositedirecn tion. A clamping rivet is provided whose shank` t extends throughthe circular plate l and is coaxial therewith. The circular metalliccondenser plates 5 and 6 are formed with openings at their centersthrough which the rivet shanlr freely passes with wide clearance. Thedielectrichetween the plates isin the form of a thin circular sheet 7 ofsuitable material and of such dia-meter as to very closely approach theinner cylindrical surface of the rim 2. The metallic condenser platesare formed each with a plurality of projections 8, there desirably beingthree equidistant projections upon each metallic plate. Each metallic'condenser plate is also desirably additionally pro-- vided with anextension 9 projecting through an opening l0 that is formed in the rim.The extensions 9 arespaced apart and are desirably formed with openingsl1 for the reception of mounting screws and perforated ears l2 to whichcircuit wires may be soldered. The metallic condenser plates aresimilarly formed but are oppositely arranged with the ears l2 upon aline passing through the axis of the condenser whereby these ears serveas a guide to the assembler in placing the parts together. The eXtension9 u aon each metallic condenser plate is disposed between twoprojections 8 and is nearer one of these projections than thev other sothat when the similarly formed metallic condenser plates are arranged asillustrated, thel projections 8 upon either plate will be staggered withrelation to such projections upon the other plate. The dielectric 7 isof such diameter that its border extends beyond the portions of theborders between the projections 8 of the metallic plates, theprojections, in conjunction with the rim Q, preventing the interveningportions of the metallic plates from extending beyond the dielectricwhich thus serves to prevent any burrs or other portions upon the borderof either metallic plate from contacting with the other metallic plate.

When the parts have been assembled in the relaticnillustrated anddescribed, an inl sulating closure disc 13 is inserted within the rim 2,this closure disc having projections 14 which are received in theopenings 10 in the rim 2. The rivet head 15 is desirably ,supplementedby a metallic disc 16 through which the shank of the rivet snugly passesand which is snugly received within the rim 3. The rivet, at its otherend, is surrounded by a metallic disc 17. When the rivet is headed at 18to clamp the parts together, the disc 17, which is Islightly crowned, isfirmly clamped against the insulating closure 13, the clamping pressureexerted by the disc 17, in being flattened, firmly securing all of theplates and discs of the condenser in iirm mechanical relation.

Having thus described my invention, I claim:

l. An electrostatic condenser including an insulating member formed withan angular rim; two metallic condenser plates assembled with saidinsulating member and disposed within said rim and each formed with aplurality of projections extending toward said rim and relativelypositioned to prevent the portions of the plate therebetween fromcontacting with said rim; and a dielectric disposed between said platesand extending beyond the aforesaid portions of the plates.

2. An electrostatic condenser including an insulating member formed withan angular rim; two metallic condenserV plates assembled with saidinsulating member and disposed within said rim and each formed with aplurality of projections extending toward said rim and relativelypositioned to prevent the portions of the plate therebetween fromcontacting with said rim; and a dielectric disposed between said platesand extending beyond the aforesaid portions of the plates, theprojections upon each plate being in staggered relation to theprojections upon the other.

3. An electrostatic condenser including an insulating member formed withan angular rim; two metallic condenser plates assembled with saidinsulating member and disposed within `said rim and each formed with aplurality of projections extending toward said rim and relativelypositioned to prevent the portions of the plate therebetween fromcontacting with said rim; and a dielectric disposed between said platesand extending beyond the aforesaid portions ofthe plates, theprojections upon each plate being in staggered relation to theprojections upon the other, said rim having spaced apart openingstherein and said plates having extensions projecting through saidopenings and engaging .said rim to preserve the staggered relation ofthe projections upon the plates.

4. An electrostatic condenser including an insulating member having anabutment; two metallic condenser plates assembled with said insulatingmember and each formed with a plurality of projections extending towardsaid abutment and relatively positioned to prevent the portions of theplate therebe` tween from contacting with said abutment;

and a dielectric disposed between said plates and extending beyond theaforesaid portions of the plates.

5. An electrostatic condenser including an insulating member having anabutment; two metallic condenser plates assembled with said insulatingmember and each formed with a plurality of projections extending towardsaid abutment and relatively positioned to prevent the portions of theplate therebetween from contacting with said abutment; and a dielectricdisposed between said plates and extending beyond the aforesaid portionsofk the plates, the projections upon each plate being' in ystaggeredrelation to the projections upon the other.

6. An electrostatic condenser including an insulating member having anabutment formation, and two metallic condenser plates assembled withsaid insulating member and each formed with projections extending towardsaid abutment formation and positioned to prevent the portions of theplate therebetween from contacting with said abutment formation. y

In witness whereof, I hereunto subscribe my name.

ERNEST E. YAXLEY.

